Do our videos HAVE to have the intro to them, even if we're not doing them for a giftcard?

Just wondered. The only ones that I see up are the ones with the intro (for the most part that I can remember). Just wondered if they have to have that intro file on it in order to upload it to your review. I have a TON of videos to upload, but most of them cannot be claimed for the giftcard because there are already videos attached to that product. So I still want to upload them to my review. Thanks! less